You may make use of third party tools to create a IP/Country Database.
e.g.
https://www.countryipblocks.net/country_selection.php
https://www.ip2location.com/free/visitor-blocker
Inside the above URL, choose .htaccess deny, and the Country/Area
Then, copy and paste the IP address list into .htaccess
For details – how to block IP to your website, please refer to
http://kb.website-solution.net/?p=24&lang=en
Note: IP/Country mapping may regularly be updated. Users shall also update their .htaccess list correspondingly.
